import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;

/**
 * Created by lanouhn on 17/7/18.
 */
public class saveImage {
    public static void main(String [] args) throws Exception{
        //网络连接对象
  //      HttpURLConnection connection = null;

        //new一个URL对象
   //     try {
            URL url = new URL("http://img1.imgtn.bdimg.com/it/u=2189643635,599158142&fm=26&gp=0.jpg");
            //打开连接
            HttpURLConnection connection = (HttpURLConnection)url.openConnection();
            //设置请求方式为"GET
            connection.setRequestMethod("GET");
            //超时响应时间为5秒
            connection.setConnectTimeout(5 * 1000);
            //通过输入流获取图片数据
            InputStream inStream = connection.getInputStream();
            //得到图片的二进制数据，以二进制封装得到数据，具有通用性
            byte[] data = readInputStream(inStream);
            //new一个文件对象用来保存图片，默认保存当前工程根目录
            File imageFile = new File("/Users/lanouhn/Desktop/cat.jpg");

            //创建输出流
            FileOutputStream outStream = new FileOutputStream(imageFile);
            //写入数据
            outStream.write(data);
            //关闭输出流
            outStream.close();

    //    } catch (MalformedURLException e) {
    //        e.printStackTrace();
    //    } catch (ProtocolException e) {
     //       e.printStackTrace();
     //   } catch (IOException e) {
    //        e.printStackTrace();
    //    } catch (Exception e) {
    //        e.printStackTrace();
     //   }

    }

    private static byte[] readInputStream(InputStream inStream) throws Exception{
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        //创建一个Buffer字符串
        byte[] buffer = new byte[1024];
        //每次读取的字符串长度，如果为-1，代表全部读取完毕
        int len = 0;
        //使用一个输入流从buffer里把数据读取出来
        while ((len = inStream.read(buffer)) != -1) {
            //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
            outStream.write(buffer, 0, len);
        }
        //关闭输入流
        inStream.close();
        //把outStream里的数据写入内存
        return outStream.toByteArray();

    }
}
